Keywords:Gravity inversion, Multi-ring basin, Impact cratering
Orientale basin is the youngest and best preserved multi-ring basin on the Moon, featured with four concentric topography rings. Those inward-facing ring scarps are suggested to be correlated with normal faults induced by the collapse of impact transient crater. GRAIL gravity data further confirmed the existence of deep penetrated ring faults around Orientale basin, which well matching their surface scarps. Geometry of those large scale normal faults provide information about the physical properties of lunar crust, and shed light to impact cratering models. In this work, we proposed a novel gravity gradient eigenvalue to emphasize concentric signatures around Orientale basin in gravity data. The possible 1300 km diameters ring outside Cordillera main rim (D~937km) is reflected in our new eigenvalue map. Gravity inversion indicates its subsurface density structures, suggesting that the modification range of impact cratering is underestimated by previous researches. Implications for the crustal properties and modeling of impact process are also discussed.